JP2011079012A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device capable of preventing a damage of a cutting blade even when the cutting blade is formed of a material with high strength. <P>SOLUTION: The cutting device 1 includes: a lower mold 10 on which a workpiece W is placed; an upper mold 20 having the cutting blade 222 that cuts the workpiece W; a slider 30 that supports the upper mold 20; a driving device 50 that moves the slider 30 to make the upper mold 20 approach to the lower mold 10; and an impact absorption device 40 that is installed between the slider 30 and the upper mold 20, and shrinks by a contact reaction force of the cutting blade 222 of the upper mold 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutting device. In detail, it is related with the cutting device which cut | disconnects a workpiece | work.

Conventionally, trim processing for cutting a workpiece has been known. In this trim processing, for example, the following press machine is used.
That is, this press machine includes a lower mold on which a work is placed, an upper mold having a cutting blade for cutting the work, a slider that supports the upper mold, and a slider that moves the upper mold to a lower mold. And a driving device to be approached (see Patent Document 1).

  According to this press machine, the driving device is driven to bring the upper die closer to the lower die, so that the upper die cutting blade is applied to the workpiece placed on the lower die, and the workpiece is cut by this cutting blade. To do.

JP 7-246430 A

By the way, in the above press machine, when a cutting blade wears, there exists a problem that the clearance of a cutting blade and a lower mold will change, and it will become easy to generate | occur | produce chips and a burr | flash.
Therefore, in order to reduce wear of the cutting blade, it is required to form the cutting blade with a high-strength material.
However, a high-strength material has a characteristic of being easily chipped because of low toughness. When the cutting blade hits the workpiece, a large impact is applied to the cutting blade, which causes a problem that the cutting blade is chipped.

  An object of this invention is to provide the cutting device which can prevent that this cutting blade breaks, even if it forms a cutting blade with a high intensity | strength material.

The cutting device of the present invention (for example, a cutting device 1 described later) includes a lower mold (for example, a lower mold 10 described later) on which a workpiece (for example, a workpiece W described later) is placed, and a cutting blade for cutting the workpiece. (For example, an upper mold 20 described below) having a cutting blade 222 (described later), a supporting means (for example, a slider 30 described later) for supporting the upper mold, and moving the supporting means, Drive means (for example, drive device 50 described later) for bringing the upper mold closer to the lower mold, and provided between the support means and the upper mold, and by contact reaction force of the cutting blade of the upper mold And an impact mitigating means that contracts (for example, an after-mentioned impact mitigating device 40).
It is characterized by that.

According to this invention, the support means is provided with the impact relaxation means that contracts by the contact reaction force of the upper cutting blade. Therefore, when the cutting blade hits the workpiece, a contact reaction force acts on the cutting blade and the impact relaxation means contracts, so that the moving speed of the cutting blade becomes slower than the moving speed of the support means, and the impact applied to the cutting blade. Can be relaxed.
Therefore, even if the cutting blade is formed of a high-strength material and the hardness of the cutting blade is improved as compared with the prior art, damage to the cutting blade can be prevented while reducing wear of the cutting blade.

In addition, in order to reduce the impact applied to the cutting blade, a method of reducing the moving speed of the cutting blade by adjusting the moving speed of the supporting means itself by the driving means can be considered, but in this method, only the cutting blade is used. In addition, since the moving speed of the upper die is also lowered, there is a problem that the cycle time of the cutting process is prolonged.
However, according to the present invention, when the cutting blade hits the workpiece, the impact relaxation means reduces only the moving speed of the cutting blade without changing the moving speed of the support means, so that the cycle time of the cutting process is prolonged. Can be prevented.

in this case,
The upper mold is provided with a movable part (for example, a movable part 22 described later) having the cutting blade and movable relative to the support means, and the support means so as to surround the movable part. It is preferable to include a frame-shaped guide portion (for example, a guide portion 24 described later) for guiding the movement of the movable portion.

  According to this invention, the upper mold is configured to include the movable portion having the cutting blade and the frame-shaped guide portion surrounding the movable portion, and the movement of the movable portion is guided by the guide portion. Therefore, since the cutting blade can be reliably applied to the predetermined cutting position of the workpiece, the processing accuracy can be improved.

  In this case, the upper mold further includes a pad (for example, a pad 23 to be described later) that presses the workpiece and can move relative to the support means, and the impact relaxation means is connected to the movable portion. A plurality of first pistons (for example, a later-described piston 321A) and a plurality of first cylinders (for example, a later-described cylinder 322A) provided on the support means and slidably accommodate each of the plurality of first pistons. ), A second piston (for example, a later-described piston 321B) connected to the pad, and a second cylinder (for example, a later-described cylinder 322B) that is provided in the support means and slidably accommodates the second piston. The plurality of first cylinders and the second cylinders are preferably in communication with each other.

According to this invention, the pad for pressing the workpiece is provided on the upper mold. Furthermore, the impact mitigating means includes a plurality of first pistons, a plurality of first cylinders, a second piston, and a second cylinder, and the plurality of first cylinders and the second cylinders communicate with each other.
Therefore, the contact reaction force transmitted from the cutting blade to the support means can be equally borne by the plurality of cylinders and pistons, so that the impact applied to the cutting blade can be further alleviated.

  According to the present invention, the support means is provided with the impact relaxation means that contracts by the contact reaction force of the upper cutting blade. Therefore, when the cutting blade hits the workpiece, a contact reaction force acts on the cutting blade and the impact mitigating means contracts, so that the moving speed of the cutting blade becomes slower than the moving speed of the supporting means, and the impact applied to the cutting blade. Can be relaxed. Therefore, even if the cutting blade is formed of a high-strength material and the hardness of the cutting blade is improved as compared with the prior art, damage to the cutting blade can be prevented while reducing wear of the cutting blade. Further, when the cutting blade hits the workpiece, the impact mitigating means reduces only the moving speed of the cutting blade without changing the moving speed of the supporting means, so that it is possible to prevent the cycle time of the cutting process from being prolonged.

It is sectional drawing of the cutting device which concerns on one Embodiment of this invention. It is sectional drawing (the 1) for demonstrating operation | movement of the cutting device which concerns on the said embodiment. It is sectional drawing (the 2) for demonstrating operation | movement of the cutting device which concerns on the said embodiment. It is sectional drawing (the 3) for demonstrating operation | movement of the cutting device which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a cutting device 1 according to an embodiment of the present invention.
The cutting device 1 includes a lower mold 10 on which a workpiece W is placed, an upper mold 20 disposed opposite to the lower mold 10, and a flat slider 30 as a support means for supporting the upper mold 20 from above. , An impact mitigating device 40 provided between the slider 30 and the upper die 20 as an impact mitigating device, and a driving device 50 as a driving means for moving the slider 30 up and down to bring the upper die 20 closer to the lower die 10. And comprising.

The lower mold 10 is fixed to the floor, and includes a support portion 11 that supports the workpiece W and a peripheral edge portion 12 that is provided so as to surround the support portion 11.
A positioning hole 121 is formed in the peripheral edge portion 12.

  The upper mold 20 includes a movable part 22 that can be moved up and down relatively with respect to the slider 30, a pad 23 that is provided through the movable part 22 and can be moved up and down relatively with respect to the slider 30, and a lower surface of the slider 30. And a frame-shaped guide portion 24 that is provided so as to surround the movable portion 22 and guides the movement of the movable portion 22.

The movable portion 22 includes a base 221, a cutting blade 222 provided on the base 221 so as to surround the pad 23, and a positioning pin 223 provided in the vicinity of the cutting blade 222 of the base 221.
The cutting blade 222 cuts the workpiece W and is made of a high-strength material. The cutting blade 222 faces the peripheral edge 12 of the lower mold 10.
The pad 23 presses the work W and faces the support portion 11 of the lower mold 10.

  The impact relaxation device 40 includes a plurality of damper mechanisms 32 provided on the lower surface of the slider 30 at predetermined intervals.

Among the plurality of damper mechanisms 32, the one located immediately above the movable portion 22 is a damper mechanism 32 </ b> A as an impact reducing means for reducing contact reaction force applied to the movable portion 22. Specifically, the damper mechanism 32A includes a piston 321A as a first rod-shaped piston that extends vertically, and a cylindrical first cylinder that is provided on the slider 30 and slidably accommodates the piston 321A in the vertical direction. A cylinder 322A.
The lower end of the piston 321 </ b> A is connected to the movable portion 22.

Further, among the plurality of damper mechanisms 32, the one located immediately above the pad 23 is a damper mechanism 32 </ b> B as an impact reducing means for reducing the contact reaction force applied to the pad 23. Specifically, the damper mechanism 32B includes a piston 321B as a rod-shaped second piston that extends vertically, and a cylindrical second cylinder that is provided on the slider 30 and slidably accommodates the piston 321B in the vertical direction. A cylinder 322B.
The lower end of the piston 321B is connected to the pad 23.
The cylinders 322A and 322B are filled with compressed air, and the cylinders 322A and 322B communicate with each other.

The above cutting device 1 operates as follows.
First, as shown in FIG. 1, the workpiece W is placed on the lower mold 10 and the pistons 321A and 321B of the damper mechanisms 32A and 32B are lowered.

Next, as shown in FIG. 2, the slider 30 is lowered by the driving device 50. Then, the positioning pin 223 of the upper mold 20 is fitted into the positioning hole 121 of the peripheral edge portion 12 of the lower mold 10, and the horizontal relative position between the upper mold 20 and the lower mold 10 is determined.
Further, the pad 23 of the upper mold 20 abuts on the upper surface of the work W, and the work W is sandwiched between the pad 23 and the support portion 11 of the lower mold 10 to prevent the work W from being displaced. At this time, as indicated by an outlined arrow in FIG. 2, a contact reaction force acts on the pad 23, the piston 321B retracts, and the damper mechanism 32B contracts. Then, the shock applied to the pad 23 is mitigated by the damper mechanism 32B.

Next, as shown in FIG. 3, the slider 30 is continuously lowered by the driving device 50. Here, since the pad 23 is in contact with the workpiece W, the pad 23 is not lowered, and only the movable portion 22, the guide portion 24, and the slider 30 are lowered, and the cutting blade 222 is in contact with the workpiece W.
At this time, as indicated by an outlined arrow in FIG. 3, a contact reaction force acts on the cutting blade 222, the piston 321A retracts, and the damper mechanism 32A contracts. Then, the impact applied to the cutting blade 222 is mitigated by the damper mechanism 32A. Further, when the damper mechanism 32A contracts, the movable portion 22 provided with the cutting blade 222 is guided by the guide portion 24 and rises relative to the guide portion 24, and the lowering speed of the movable portion 22 is as follows. The lowering speed of the guide portion 24 and the slider 30 becomes slower.

  Next, as shown in FIG. 4, the slider 30 is continuously lowered by the driving device 50. Then, the workpiece W is cut by the cutting blade 222.

According to this embodiment, there are the following effects.
(1) The slider 30 is provided with a damper mechanism 32 </ b> A that contracts by the contact reaction force of the cutting blade 222 of the upper mold 20. Therefore, when the cutting blade 222 hits the workpiece W, a contact reaction force acts on the cutting blade 222 and the damper mechanism 32A contracts, so that the lowering speed of the cutting blade 222 becomes slower than the lowering speed of the slider 30, and the cutting is performed. The impact applied to the blade 222 can be reduced.
Therefore, even if the cutting blade 222 is formed of a high-strength material and the hardness of the cutting blade 222 is improved as compared with the prior art, damage to the cutting blade 222 can be prevented while reducing wear of the cutting blade 222.

  Also, when the cutting blade 222 hits the workpiece W by the damper mechanism 32A, only the moving speed of the cutting blade 222 is reduced without changing the moving speed of the slider 30, so that the cycle time of the cutting process is prolonged. Can be prevented.

  (2) The upper mold 20 includes a movable portion 22 having a cutting blade 222 and a frame-shaped guide portion 24 surrounding the movable portion 22, and further guides the movement of the movable portion 22 by the guide portion 24. I let you. When the movable portion 22 moves, the guide portion 24 can prevent the movable portion 22 from shifting in the horizontal direction, so that the cutting blade 222 can be reliably applied to a predetermined cutting position of the workpiece W. Processing accuracy can be improved.

  (3) A pad 23 for pressing the workpiece W is provided on the upper mold 20. Further, the impact relaxation device 40 includes pistons 321A and 321B and cylinders 322A and 322B, and the cylinder 322A and the cylinder 322B are communicated with each other. Therefore, the contact reaction force transmitted from the cutting blade 222 to the slider 30 can be equally borne by the plurality of cylinders 322A and 322B and the pistons 321A and 321B, so that the impact applied to the cutting blade 222 can be further alleviated.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.

W Work 1 Cutting device 10 Lower mold 20 Upper mold 22 Movable part 23 Pad 24 Guide part 30 Slider (support means)
40 Impact mitigation device (impact mitigation means)
50 Driving device (driving means)
222 Cutting blade 321A Piston (first piston)
321B piston (second piston)
322A cylinder (first cylinder)
322B cylinder (second cylinder)

Claims (3)

A lower mold on which the workpiece is placed;
An upper mold having a cutting blade for cutting the workpiece;
Support means for supporting the upper mold;
Driving means for moving the support means to bring the upper mold closer to the lower mold;
An impact mitigating means provided between the support means and the upper die and contracting by a contact reaction force of the upper die cutting blade. The cutting device according to claim 1, wherein
The upper mold has the cutting blade and is movable relative to the support means, and is provided on the support means so as to surround the movable part to guide the movement of the movable part. A cutting device comprising: a frame-shaped guide portion. The cutting device according to claim 2, wherein
The upper mold further includes a pad that presses the workpiece and is movable relative to the support means,
A plurality of first pistons connected to the movable part;
A plurality of first cylinders provided in the support means and slidably accommodating each of the plurality of first pistons;
A second piston coupled to the pad;
A second cylinder provided in the support means and slidably accommodating the second piston,
The cutting device, wherein the plurality of first cylinders and the second cylinder communicate with each other.

Images